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Asthma Triggers

Topic Overview

An
asthma trigger is a factor that can lead to sudden
difficulty breathing or other symptoms of asthma (asthma attack).

Some triggers are substances a person may be allergic to (allergens). Allergens cause the body's natural
defenses (immune system) to produce chemicals called
immunoglobulin E (IgE) antibodies. These chemicals bind to allergens, causing
inflammation of the bronchial tubes, which carry air
to the lungs. The allergen may also cause asthma attacks. These triggers
include:

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